I'd say the real problem is that the power circuitry _within_ the boats/ships are designed to handle quite a bit of load. But the physical connections _on/off_

I'd say the real problem is that the power circuitry _within_ the boats/ships are designed to handle quite a bit of load. But the physical connections _on/off_ the boat are likely not designed to carry it. To do this properly would require some redesign of Navy ships/boats.